It would be swell if there was a setting (i.e. persistentEventSelection: true) where a selected event would keep being selected even if scheduler loses focus (clicking outside of scheduler). We have a lot of functionality connected to the event selection (custom edit event, copy event to another page etc) and this feature would really help.

You are right, I wasn't very clear in my post. The selection is persistent but the b-active class is removed from the event whenever the scheduler loses focus. Since we only have single-selection the b-active class serves as the far more dominant selection-marker than the change of event color which is the "true" selection marker. I guess my feature request needs to be changed to be about the b-active class being persistent rather than the selection itself.